Lifting-jack



H. M. KNOX.

LIFTING JACK.

APPLlCATlON FILED MAR.12. 1921.

6 y :n i 6 m I a '7 INVENTOR fii'le flfffizox BY a ATTORNEYS PATENT OFFICE.

HARLEY M. KNOX, F PENOKEE, KANSAS.

LIFTING-JAC'K.

Specification of Letters Patent.

Patented Nov. 8, 1921.

Application filed March 12, 1921. Serial No. 451,775.

T 0 all whom it may 007106770.

Be it known that I, HARLEY M. Kxox, a citizen of the United States, and a resident of Penokee, in the county of Graham and State of Kansas, have invented a new and Improved Lifting-Jack, of which the following is a full, clear, and exactdescription.

This invention'relates to improvements in lifting jacks, an object of the invention being to provide a jack, which is primarily designed for quickly raising the axle of a small automobile oil' the ground and a jack in which the weight of the car will operate to maintain the same in elevated position after it has been raised by the jack.

A further object is to provide a novel form of adjusting means, which will permit the jack to be used with axles of various heights.

A still further object is to provide a jack, which will be simple and practical in construction, strong, durable and efiicient in use, and comparatively inexpensive to manufacture.

\Vith these and other objects in View, the invention consists in certain novel features of construction and combinations and arrangements of parts as will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawing Figure 1 is a view in side elevation of my improved jack, the dotted lines indicating the position of the lever when an axle is supported on the jack;

Fig. 2 is a fragmentary view in section on the line 2-2 of Fig. 1;

Fig. 3 is a similar view illustrating the pin 15 in retracted position; and

Fig. 4. is a fragmentary view in section on the line H of Fig. 3.

Referring in detail to the drawings, 1 represents a base or platform upon which is supported an upright hollow column 2 preferably rectangular in cross section. Webs such as 3, may be made integral with the base and column to strengthen their connection.

Two opposite sides of the column 2 are formed with a ned openings 4. A bar 5 slidable vertically in the column is provided with a series of perforations 6 throughout its length any one of which may be moved into registry with the perforatinis 4.

The bar 5 terminates at its upper end in a widened bifurcated portion including a pair of upwardly extended arms 7, which straddle an extension or lug 8 on a lever 9. A bolt or similar device 10 serves to pivot the lug 8 between the arms 7. The lever is thus fulcrumed adjacent one end and terminates in an enlarged portion such as 11 formed with an axle receiving socket 11'.

A handle member 12 in the form of a sleeve telescopes on the lever 9, and a stud 13 on the lever has limited movement in a slot 14 in the member 12. A pin 15 is passed through the perforations 4 and selectively through one of the perforations 6 to lock the bar 5 at any desired elevation. A guide bracket 16 is afiixed to the outer face of the column 4 and a cam 17 of substantially semi-circular shape is pivotally connected at one end to the outer end of the pin 15. The cam is movable under the bracket 16, so that by pushing the free end of the cam, the pin will be retracted, as will be readily understood. A screw or similar securing device 18 is passed through the intermediate portion of the bracket and holds the bracket against the column, and is engageable with the free end of the cam 17, to limit the retraction of the pin from the recesses.

In operation, the bar 5 is locked at the desired elevation. The handle member 12 is swung upwardly and the jack is moved until the socket 11 engages under the axle of a car. The handle 12 is then depressed until its free end engages the ground, as indicated in dotted lines in Fig. 1. When the handle is in this position, the socket member will have moved to the other side of the fulcrum 10 so that the weight of the car will be supported by the handle 12 and the bar 5. To lower the car, the handle is again moved upwardly to the position indicated in full lines in Fig. 1. The jack may be folded and stowed away in a comparatively small space.

Various slight changes and alterations might be made in the general form and arrangement of the parts described without departing from the invention and hence I do not wish to limit myself to the precise details set forth, but shall consider myself at liberty to make such slight changes and alterations as fairl fall within the spirit and scope of the appended claims.

I claim:

1. In a jack, a base, a hollow column affixed to the base. a bar slidable vertically in the column, a lever fulcrumed adjacent one end in the upper end of thebar, said column having alined perforations in opposite sides thereof, said bar having a series of perforations adapted to register with the perforations in the column,apinmovable through the alined perforations, a bracket fixed to the outer face of the column, an arcuate cam pivoted to the outer end of the pin and movable between the bracket and. guided in itsv movement by a base, ahollow column one end in the upper end of the bar, said column having alined perforations in 0pposite sides thereof; said bar having a serles of perforations adapted to register with the perforations in the column, a pin movable through the alined perforations a bracket fixed tothe outer face of the column, an arcuate cam pivoted to the outer end of the pin and movable between the bracket and the column, and means associated with the bracket engageable'with the free end of thecam and limiting the outward movement of the pin. from the column.

HARLEY M. KNOX. 

